DevTools: Push out histogram expiration

This CL pushes out the expiration of two histograms by a year:
DevTools.KeyboardShortcutFired and DevTools.KeybindSetSettingChanged

Bug: 1130657, 174309
Change-Id: Id6af73627f34477ed4b87e2b42df547cd42fb28d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432136Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Robert Paveza <Rob.Paveza@microsoft.com>
Reviewed-by: Vidal Diazleal <vidorteg@microsoft.com>
Commit-Queue: Jack Lynch <jalyn@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#811422}

tools/metrics/histograms/histograms_xml/dev/histograms.xml

@@ -210,7 +210,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="DevTools.KeybindSetSettingChanged" enum="DevToolsKeybindSets"
-    expires_after="2020-10-31">
+    expires_after="2021-10-31">
   <owner>yangguo@chromium.org</owner>
   <owner>jalyn@microsoft.com</owner>
   <owner>leo.lee@microsoft.com</owner>
@@ -221,7 +221,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="DevTools.KeyboardShortcutFired"
-    enum="DevToolsKeyboardShortcutAction" expires_after="2020-10-31">
+    enum="DevToolsKeyboardShortcutAction" expires_after="2021-10-31">
   <owner>yangguo@chromium.org</owner>
   <owner>jalyn@microsoft.com</owner>
   <owner>leo.lee@microsoft.com</owner>